Salva is scared because there is a lot of commotion around him. For example, guns are shooting people are screaming and yelling and are dying.This shows why he is scared because he is running for his life and all the commotion is scaring him even more.
Salva went from being scared to being fearless. This shows him being fearless because he had almost crossed the Gilo river when he could have died by being shot or been eaten by a crocodile.
This shows Salva's growth because he went from being scared in the beginning to joyful in the end. this shows that Salva is joyful because he got a email from a clinic in South Sudan saying that his dad was still alive. Salva is joyful because he hadn't seen his dad in ten years. This hope came true for Salva that his family was alive.